Having tested for a false positive of Amphetimines before, I can say this: If you have an acute amount of Tylenol, Aspirin, Aleve etc in your system, it can lead to either a false barbitute or amph false positive.
I know this, from personal reasons. I have a heart condition, and passed out at work. I had been having terrible headaches so I was taking tylenol as often as was allowed.
During my lovely stay in the hospital it came out they thought I had taken amphetimines which caused my heart condition. They swore it, and even wanted to transport me to a drug rehab after leaving the hospital.
Come to find out, my sister did research on the topic, and showed the hospital all her findings.
Not saying this is true in Brit's case, but having been there done that, can go by my experiences.
Many things, cause false positives.
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When I was a kid my favorite relative was Uncle Caveman. After school we’d all go play in his cave, and every once in a while he would eat one of us. It wasn’t until later that I found out that Uncle Caveman was a bear. ~ Jack Handey
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